Alternator BOSCH in VW 70A, 90A, 120A, 140A how do they differ?

Question

Hello The question applies to Bosch alternators mounted in the VW group - how do the different models differ? In appearance they are identical, when they are dismantled they are also identical. The mountings are the same, they can be mounted interchangeably - and the difference is in the max...

Anonymous · Accepted Answer

Winding wire thickness and amount.

Strumien swiadomosci swia · Accepted Answer

Well, that you drank sharply, buddy, everyone has a different rotor, the higher the current, the larger the rotor, and hence the larger the stator. 120 140 has the same rotor but different diodes. Bravo zero perceptiveness.

andrzej20001 · Accepted Answer

More coils and their other diameter, hence greater power.

robokop · Accepted Answer

Even 20 or 50 phase will not have a larger rated current without increasing the core dimensions - the excitation flux is still the bottleneck. And then heat dissipation from the whole.

grzegorzbuczylo · Answer

Sometimes the number of diodes in the rectifier system and the number of winding leads. For posterity, whoever asks, I have a 120A alternator in the Passat b4 1.9tdi and I installed the VARTA AGM 92AH battery and I have been driving for a year and there is no problem with recharging.

Anonymous · Answer

This alternator can cook an even larger battery. Regards

robokop · Answer

The diameter and width of the winding yoke, and hence the thickness of the wire used, the magnet (rotor) then will also have a different diameter and length. Due to the different magnetizing current characteristics, you will have other regulators - probably in terms of switching frequency and allowable current. And why should they be? In tractors you have 55-75A alternators and 170Ah batteries - somehow there are no problems. In my private dump truck I have a 45Ah battery and a 120A alternator, and I also play without failure?

grzegorzbuczylo · Answer

Well, I wrote because there is always a question whether he tops up.

Stanisław Chwalisz · Answer

Alternators increase the current because they differ in structure. They are made as 3-phase, 6-phase, 9-phase and 12-phase and hence greater current.

tata1 · Answer

Not zero perceptiveness, only when I replaced bearings in one, at a time I had only dismantled one - hence they seemed to me the same. That is why I set up this topic, because I was curious how the hell they differ, since they are the same in appearance. They have an identical arrangement of diodes, the rear plastic cover physically fits on each of these models interchangeably. I have not measured the caliper wire, as well as the diameter of the rotor or the entire alternator, but the differences must be small, because you can not see them by eye. Now I just take the bearings in this 140A in Sharan, and the car must drive, I threw a 90A there temporarily and that's where the topic was because I thought 140 would be visually bigger, and this chick ... similar.

andrzej20001 · Answer

Because of this are hydrocele

tata1 · Answer

Yes, they differ in size - the diode arrangement is identical In fact, when you put them next to each other, you can see how 140A is more inflated in relation to 90A. This is especially visible when you put them on the pulley and look from the side of the plastic diode cover. In 140A the body protrudes from the cover more than in 90A. I was deceived by the fact that they have the same diode covers and physically fit interchangeably, and I was confused by the fact that they are roughly identical. However, the forum is to figure out the details - thanks for your help.

Alternator BOSCH in VW 70A, 90A, 120A, 140A how do they differ?

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